GB2565286A

GB2565286A - A bath waste assembly

Info

Publication number: GB2565286A
Application number: GB1712609.5A
Authority: GB
Inventors: Julian Burrows Andrew
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-08-06
Filing date: 2017-08-06
Publication date: 2019-02-13
Also published as: GB201712609D0; GB201720564D0

Abstract

A bath waste assembly 100 for fitting to a bath having a first outlet 130 allowing fluid 115 to flow from the bath 200 to a drain via a first flow path; a second inlet 140 and a second inlet 150 being fluidly connected via a second flow path channel 181 wherein if the drain plug 120 is in the open position, the fluid 115 in the bath 200 will drain via the first outlet 130; and if the drain plug is in the closed position, the fluid 115 will be able to flow from the second inlet 154 to the second outlet 150, allowing fluid to be taken from and returned to the bath. The assembly may be disposed in the bath’s standard waste opening, or fitted to both the standard waste opening and standard overflow opening wherein bath water is returned to the bath via the second outlet disposed in the overflow aperture (fig 5). The water may be circulated by a pump, filtered and heated, in order to regulate the temperature of the water in the bath. A method of controlling the bath waste assembly, via a controller and temperature and fluid sensors.

Description

TITLE - A Bath Waste Assembly

TECHNICAL FIELD

The present invention relates to a bath waste assembly, a controller and a method of controlling and maintaining the fluid temperature in a domestic bath.

Aspects of the invention relate to a bath waste assembly, a method of control, a controller and method of assembly.

BACKGROUND OF THE INVENTION

Most homes are fitted with domestic baths for bathing and washing. The comfort of the user of a bath can be influenced by the temperature of the water (fluid) in the bath. The ambient room temperature, water temperature and user skin temperature all influence how comfortable the user feels and how long the user is willing to stay in the bath before they themselves start to feel cold. After the bath is run, over a short period of time the bath water temperature falls and the user will tend to feel more and more cold. The water in the bath can cool down at a rate which is dependent upon the rate at which heat is dissipated to the surrounding areas. This heat dissipation is dependent upon the surface area of the bath in contact with the water and also the ambient temperature of the air around the bath. In a normal house with an ambient temperature of 20 degree C, using a standard bath of circa 1700mm x 700mm and a water fill volume of circa 0.1 m3, the temperature drop can be in the region of 01. to 0.2 degrees C per minute for example.

Further if the initial user of the bath accidentally runs a bath which is too cold in the first place then that can seriously cut short the time in which the user is willing to stay in the bath before having to get out due to feeling cold. Some houses do not have very large hot water cisterns so if a bath is run incorrectly there may be no way to increase the bath temperature for the user. Even in houses where there is a permanent source of hot water, the flow rate can be slow and the level in the bath could have to be adjusted to allow for the additional volume of water to be added which increases the amount of time required to prepare the bath which is a waste of time. This is a waste of water and time for the user and ultimately the final level of the bath water may be higher than the user intended leading to unwanted spillages on the floor.

Prior art such as Jacuzzi's are fluid baths which can be heated and are designed to be used indoors and outdoors. Jacuzzis can come with heaters designed to maintain the baths fluid at a fixed temperature, however they have a multiple custom designed complex network of pipes which use multiple and distributed entry and exit points on the bath.

The invention uses only standard orifices already cut into the standard 1700mm x 700mm (standard size example and is not intended to be limiting) bath skin and no further cut outs are required. The standard cut outs referred to are firstly the standard bath waste opening cut out which is located in the lower horizontal surface of the bath and usually has a diameter of circa 50mm to 53mm which is always used as the main drain point for draining a bath of fluid. Optionally the standard overflow opening (circa 52mm dia) which is located in the substantially vertical surface of the bath located above the standard main waste drain point and is used as an emergency overflow point for when the bath is over filled and can also optionally form part of the invention.

It is an aim of the invention to be installable form new or retro fitable to any current bath installation without the need for pipework changes or spatial modifications around the bath.

It is an objective of embodiments of the invention to provide comfort improvements to a bath user in a package efficient way without extensive pipework or modifications required to conventional bath appliances and to invention and to at least mitigate one or more of the problems of the prior art.

SUMMARY OF THE INVENTION

Aspects of invention relate to a bath waste assembly, a controller and a method of controlling and maintaining the fluid temperature in a domestic bath.

According to an aspect of the present invention there is provided a bath waste assembly (for fitting to a bath, the bath waste assembly comprising a first flow path for allowing fluid to flow from or to the bath, a drain plug arranged to be in an open position or a closed position, a first outlet allowing fluid to flow from the bath to a drain; a second outlet and a second inlet being fluidly connected via a second flow path channel, wherein if the drain plug is in the open position, the fluid in the bath will drain via the first outlet and if the drain plug is in the closed position, the fluid will be able to flow from the second inlet to the second outlet, by exchanging fluid with the volume of fluid contained in the bath. The advantage is that the bath waste assembly can now be fitted to the bath in a standard cut out location and circulate fluid flow into and out of the bath. The waste plug position determines whether the fluid can be circulated into and out of the bath or indeed goes to drain.

In an embodiment, the invention comprises a bath waste assembly, wherein the bath waste assembly is disposed in the standard waste opening in the bath and fluid is taken from and returned to the bath through the standard waste opening when the drain plug is in the closed position. The advantage here is that no modifications to a standard bath skin or shell are necessary and you only need to fit the bath waste assembly into the standard waste cut out in the bottom of the bath.

In an embodiment, the invention comprises a bath waste assembly, wherein the bath waste assembly has a first bath fitting and second bath fitting which is disposed in the standard bath waste opening and standard overflow opening positions respectively in the bath, Wherein fluid is taken from the bath through the standard waste opening and returned to the bath through the standard overflow opening, when the drain plug is in the closed position. This approach uses both standard cut outs in the bath skin without modification and advantageously allows the water to re enter the bath from the top for better mixing.

In an embodiment, the invention comprises a bath waste assembly comprising a pump, disposed between the second outlet and the second inlet to pump fluid through the bath. Advantageously the pump will help circulate fluid through the bath and enable external fluid treatment

In an embodiment, the invention comprises a bath waste assembly comprising a fluid heater element disposed between the second outlet and the second inlet which will be able to heat the bath fluid.

In an embodiment, the invention comprises a bath waste assembly wherein the second outlet is below the second inlet and when the fluid heater element heats the water a buoyancy flow pumps fluid around the second flow path channel. Advantageously there is no need for a pump in this arrangement and it could be quieter.

In an embodiment, the invention comprises a bath waste assembly comprising one or more water flow deflectors disposed between the second inlet and the second outlet, wherein the one or more water flow deflectors can be in the bath waste assembly or plug and is configured to direct fluid into and/or out of the bath. Flow deflectors could advantageously deflect hot water away from a users feet for example, or promote better mixing by sending water to a larger volume of water in the bath, or prevent immediate and unwanted cross over flow between the water entering and leaving the bath which is undesirable as little mixing takes place and the heat would not be effectively introduced into the bath fluid.

In an embodiment, the invention comprises a bath waste assembly comprising one or more fluid filter disposed between the second outlet and the second inlet. Advantageously this filtration can remove debris and unwanted solids from the fluid flow and could prevent blockages in the pipes or channels including the heater element and pump system.

In an embodiment, the invention comprises a bath waste assembly comprising a drain plug wherein one or more fluid filter is disposed in the drain plug and between the flow of second inlet and the second outlet. Ina n embodiment the plug could be removable and the filter would be removed with it for easy cleaning and access to the rest of the invention pipework.

In an embodiment, the invention comprises a bath waste assembly comprising one or more duct or conduits attached to the standard overflow opening on the inside of the bath volume, wherein when flow enters the bath through the second inlet, the fluid is directed downwards into the bath and optionally under the surface of the fluid in the bath. Having a conduit attached to the standard overflow opening on the inside of the bath could be advantageous in terms of being able to direct the fluid such that it did not make noise or could avoid a users body parts. The fluid entering the bath could be at a different temperature to the bulk fluid temperature so being able to direct fluid away from the user may prevent discomfort.

In an embodiment, the invention comprises a bath waste assembly comprising one or more of, a temperature sensor, a fluid level or presence sensor (L1), a pressure sensor (P1) and a thermal switch (S2) disposed between the second outlet and the second inlet. The outputs of these sensors could be used as an input to a controller advantageously.

In an embodiment, the invention comprises a bath waste assembly comprising a bypass pipe disposed in or around the second flow path channel wherein the bypass pipe will bypass any one or more of: fluid heater element and pipes, filter when pressure builds to a first threshold pressure (Psetb).

In an embodiment, the invention comprises a bath waste assembly comprising an overflow pipe disposed in the second bath fitting. This advantageously integrates the standard overflow function and the return flow from the bath waste fitting into the second bath fitting without the need for a second hole cutting in the bath.

In an embodiment, the invention comprises a bath waste assembly comprising the return flow of fluid to the bath is directed to the substantially vertical side wall of the bath which promotes mixing and avoids user discomfort potentially

In an embodiment, the invention comprises a bath waste assembly comprising a status indicator using an LED screen or a light system wherein the status indicator would indicate one or more of the following status during bath waste assembly operation being normal operation, fault status, blocked filter or person detected entering the bath. This will be helpful to the user as information.

According to an aspect of the present invention there is provided a method of controlling a bath waste assembly wherein the pump (P) is switched on only when a first fluid level is detected in the bath waste assembly by the fluid level or presence sensor. This ensures the pump does not run when the bath waste assembly is empty of fluid which could be noisy and even damage the pump.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein the heater element is switched on to control the temperature of the fluid in the bath dependent on the temperature sensor (S1) temperature and the target set point temperature (TSetP). This ensures the heater of the fluid is only on when required to regulate the temperature of the bath fluid.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein a target set point temperature (TSetP) is set by the user or could be a factory preset value. This advantageously allows the user to vary the target regulation temperature.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein a target set point temperature (TSetP) could be set anywhere between 1 degrees C and 60 degrees C. This gives a fine control range for the user.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein the temperature rise rate of the temperature sensor (S1) is used to determine if the fluid filter is blocked or restricted. This is an indirect second use of a sensor which can be used to infer a blockage and may allow the user of a delete a direct pressure sensor from the design.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein the heater element is switched off dependent on the temperature rise rate of the temperature sensor (S1) and/or a pressure or pressure rise rate in pressure sensor (P1). Advantageously provides a means of control.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein if the temperature of sensors (S1) or (S2) is greater than a second temperature (TsetH) then the bath waste assembly is switched off. This will prevent the user from burning themselves if the bath waste assembly heater remains on during a fault condition.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein a thermal cut out switch (S2) is disposed in the system and would need to be manually reset. This is a hardware solution that would force the user to investigate a fault and adds to the safety of the devices design.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein the temperature difference between the water entering the bath waste assembly and recalculating back into the bath via waste assembly is controlled by varying the speed of the pump. This approach advantageously allows the controller to control the temperature difference across the water entering the bath waste assembly and recalculating back into the bath even with a fixed heater output rating.

In an embodiment of the invention there is provided a method of controlling a bath waste assembly wherein the controller will detect a pressure rise from pressure sensor (P1) and do one or more of the following being the user display will advise the bath user that the bath is aware of the users presence, switch one or more of the pump (P) and heater on or change the pump flow rate. These are useful controls to apply to a premium product version of a bath waste assembly and may provide product differentiation between brands in the long run.

According to an aspect of the present invention there is provided a controller comprising a processing means and a memory means, wherein the memory means comprises instructions that, when executed by the processor to cause the processor to implement a method of control thus providing safe temperature control within the bath waste assembly.

According to an aspect of the present invention there is provided a method of assembly wherein the top hat is inserted into the waste casing and fixed together using the screw which ill advantageously prevent the two components from separating during use.

According to an aspect of the present invention there is provided a bath comprising a bath waste assembly which will allow high volume take up of the invention throughout the world.

Within the scope of this application it is expressly intended that the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. That is, all embodiments and/or features of any embodiment can be combined in any way and/or combination, unless such features are incompatible. The applicant reserves the right to change any originally filed claim or file any new claim accordingly, including the right to amend any originally filed claim to depend from and/or incorporate any feature of any other claim although not originally claimed in that manner.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which,

In an embodiment of the invention.

Figure 1 shows a schematic representation of a first example embodiment of the invention;

Figure 2 shows a schematic representation of a first example embodiment of the invention as shown in figure 1, showing fluid flows in a first configuration ;

Figure 3 shows a schematic representation of a first example embodiment of the invention as shown in figure 1, showing fluid flows in a second configuration ;

Figure 4a shows an example cross section taken through an example drain plug shown in figure 1;

Figure 4b shows an example partial end section x-x view taken from figure 4a, , in the direction of arrow A;

Figure 5 shows a schematic representation of a second example embodiment of the invention;

Figs 6A, 6B and 6C show three views of an example apparatus of the first example embodiment shown in fig 1;

Figs 7A, 7B and 7C show three views of another example apparatus of the first example embodiment shown in fig 1;

Figure 8 shows an example control system for the bath waste fitting (100);

Figure 9 shows an example control method for the system shown in figure 8.

Figure 10 shows a diagram of a standard high volume bath (prior art) and the example positions of the standard waste opening (160) and the standard overflow opening (165)

DETAILED DESCRIPTION

The following description covers two examples embodiments of the invention (figures 1,2,3, 6A, 6B, 6C, 7A,7B and 7C) where the invention is sited in the standard waste opening (160) only in the bath and a further embodiment where the invention utilises both of the standard waste opening (160) and the standard overflow opening (165). A bath waste assembly (100) in accordance with an embodiment of the present invention is described herein with reference to the accompanying Figures.

Figures 1,2 and 3 show a schematic flow representation examples of a first embodiment of the invention . Figure 1 shows a bath (200) with two standard cut outs for the standard waste opening (160) and the standard overflow opening (165). The bath (200) could be any fluid bath but in this example the bath (200) is a domestic bath (200) used for bathing purposes and could be filled with water.

Figures 1,2 and 3 show a first embodiment which shows a bath waste assembly (100) fitted into the standard bath drain plug location at waste opening (160). Fluid (115) in this embodiment is taken from the bath (200) via the first flow path (110) and returned to the bath (200) after optional heating via the first flow path (110). The first flow path (110) for example is a region above the bath waste assembly (100) when located in the waste opening (160) position in the bath (200). Note only one standard waste opening is used in this embodiment and is able to both take fluid from the bath and return it to the bath using the single standard orifice in the bath (200) at the waste opening (160) position. Fluid can flow both to and from the bath via the first flow path (110). Two example versions of the first embodiment are shown in figures (6A,6B,6C) and (7A,7B,7C) respectively and will be described later.

Figure 5 shows a second example embodiment of the invention which uses both standard bath (200) waste openings being waste opening (160) and the overflow opening (165). This second embodiment again does not require any modifications to the standard bath cut outs as supplied in any regular bath. The second example embodiment is an alternate way of taking fluid (115) from the bath (200), optionally heating it and returning fluid(115) to the bath (200) in the region of the first flow path as will be described later.

Both example embodiments of the inventions could be easily newly installed or retro fitted as a replacement for a standard waste assembly without the need for modification to the bath (200) and this is an important advantage of this invention over known Jacuzzi type installations.

In figure 1, a standard overflow pipe (127) is shown fluidly connecting the overflow opening (165) to a lower portion of the bath waste assembly (100) and its function is to act as an emergency overflow if the bath is overfilled. Any fluid entering overflow pipe (127) via the overflow opening (165) would drain through the pipe and away to a main drain (not shown). This overflow is a standard feature of any bath fitting set and does not form part of the invention in this embodiment. The overflow pipe (127) could be fitted to the bath waste assembly (100) (not shown) or could be connected to the drainage pipe downstream of the fist outlet (130).

The bath waste assembly (100) is shown installed to the standard waste opening (160) but no means of fixing is shown to simplify the diagram. A seal (34) is showing the position of a seal required to prevent fluid leaking away from the bath (200).

The bath waste assembly (100) has a first flow path (110) fluidly connecting the bath fluid (115) to the bath waste assembly (100). In this embodiment the first flow path (110) could have flow in either direction dependent on how the bath is being used as will be described.

In an embodiment the bath waste assembly (100) could have a first flow path (110) which can allow fluid to flow either into or out of the bath (200) depending on the position of the plug. A drain plug (120) example is shown fitted in the region of the first flow path (110) and flow in the bath waste assembly is determined by the drain plug (120) position in this embodiment, as will be described later. A first outlet (130) could be connected to a conventional waste drain pipe (not shown) and could be use to drain the bath (200) when required.

The bath waste assembly (100) has a second outlet (140) and a second inlet (150) being fluidly connected via external pipes (170, 175, 180) in this example. The external pipes (170, 175, 180) could be called a second flow path channel (181) or conduit. A pump (P) is fluidly connected between the second outlet (140) and the pipe (170), a heater element (185) is fitted into the flow path of the fluid between the pipe (170, 175). Example temperature sensors (S1,S2) are fitted at points on the pipe which are suitable to measure the fluid temperature in the pipes. A fluid level I presence sensor (L1) is fitted into one of the external pipes (170, 175, 180) which will detect the presence of fluid and could be used in conjunction with a control system to ensure that water was present in the system before pumping or heating could take place. The fluid level sensor (L1) could be a float device, a pressure change device or an electrical resistance change device for example, being used with suitable control electronics and a control system.

Sensor (S1) could be a temperature sensor suitable for measuring the fluid temperature in the pipe work and could be used to thermostatically control the heater (185) element via a control circuit which is known based on a first temperature level I threshold.

Sensor (S2) could be a temperature sensor suitable for measuring the fluid temperature in the pipes and could be used to detect whether the fluid temperature in the pipe had exceeded a second temperature level I threshold. This could act as a backup safety cutout in case of heater failure for example and when connected to a control system could be used to shut down the bath waste assembly (100) operation and stop the bath user from becoming too hot or burned.

As an alternative, sensor (S2) could for example be a direct acting thermal cutout such a as a bimetallic switch which would act to terminate the operation of the heater element (185) and pump (P) if a second temperature level was exceeded. In this example the sensor (S2) could need to be manually reset to establish power such that a qualified electrician could investigate why the bath waste assembly (100) had reached a second temperature threshold.

The order of the components sensor (S1,S2), Pump (P) heater (185), pressure sensor (P1) and level sensor (L1) could be placed in any order dependent on the design and the order shown should not be regarded as limiting.

In this example embodiment (figure 1) the pump (P) when switched on could take fluid from the first flow path (110) , through the second outlet (140), through the pump (P), through the pipe (170), over the heater (185) element, through the pipes (175, 180), over the temperature sensors (S1,S2) and back to the first flow path (110) in the bath (200) via the second inlet (150). A pressure sensor (P1) is shown in figure 1 and could be used to sense system fluid pressure for the purpose of detecting filter blockages or restrictions. Detecting a fluid pressure rise rate over time using pressure sensor (P1) could be indicative of build up of unwanted debris in the system and could be trigger for indicating that maintenance was required in the bath waste assembly (100). A drain plug (120) is shown fitted in the region of the first flow path (110) and in this embodiment the drain plug (120) has 2 main functions which will be described using figures 2 and 3. The first function is for the drain plug (120) to control fluid level in the bath (200) and the second function is to direct the flow of fluid exchange in the bath via the external pipes (170, 175, 180). A drain plug (120) can have an open position and a closed position and fluid flow is dependent upon the drain plug (120) position. A drain plug (120) could be completely removed from the bath if required for cleaning or access to fluid flow filters (not shown).

Figure 2 shows a schematic diagram of an example bath waste assembly (100) fitted to a bath (200) with the drain plug (120) in the closed position. The plug (120) in the closed position has an example seal (220) which is sealing against the seat (210) of the bath waste assembly (100) thus preventing fluid in the bath (200) from draining via the first outlet (130). Additionally, when the drain plug (120) is in the closed position it is possible for fluid to flow from the first flow path (110) in the bath (200) and into the first drain plug region (110B) within the bath waste assembly (100), through the second outlet (140), through the pump (P), through the pipe (170), over the heater (185) element, through the pipes (175, 180), over the temperature sensors (S1,S2), back into the first flow region (110A) via the second inlet (150) and then back into the first flow path (110) in the bath (200). The recirculating flow path for the fluid is clearly marked with arrows marked F1 to F7 and collectively this series of pipes are fluidly connected and could be called a second flow path channel (181).

It can be seen that the fluid in the bath is being circulated around the second flow path channel (181) and could be heated if it was passed over a heater (185) before it was returned to the bath (200) at a higher temperature. An in line filter could also be fitted to the second flow path channel (181) not shown.

Importantly the fluid is being taken from the bath and then returned to the bath (200) and this is being achieved through the standard waste opening (160) without any need for additional holes being created in the bath (200) structure.

Figure 3 shows a schematic diagram of a example bath waste assembly (100) fitted to a bath (200) with the drain plug (120) in the open position. It can be seen that the plug (120) is in the open position and it is now possible for fluid (115) in the bath (200) to flow into both flow path regions(110A,110B) then to flow between the seal (220) and the seat (210) of the bath waste assembly (100), then flow is free due to gravity to flow into the first outlet (130) and on to a main drain (not shown). Flow arrows F8 to F10 show the flow path of the fluid (115) draining from the bath (200) with the drain plug (120) in the open position.

Additionally, when the drain plug (120) is in the open position, any fluid held in the external pipes (170, 175, 180), heater (185) and pump (P) could be free to drain through both drain plug regions(110A,110B) then to flow between the seal (220) and the seat (210) of the bath waste assembly (100), then flow into the first outlet (130) and on to a main drain (not shown). This advantageously makes sure that no water is retained in the bath waste assembly (100) when the drain plug is in the open position, thus avoiding stagnant water which could smell or form bacteria.

The schematic diagram of figures 1,2 and 3 all show external pipes (170, 175, 180) and heater (185) regions which are lower than the second inlet (150) and the second outlet (140) but these figures 1,2 and 3 are drawn in this schematic way to give clarity to the fluid flows of the system. In a physical embodiment of the invention the external pipes (170, 175, 180) pump (P) and heater (185) regions would be level with or slightly higher than the second inlet (150) and the second outlet (140) so that gravity would drain the pipes (170, 175, 180) pump (P) and heater (185) regions to the first outlet dependent on the drain plug (120) position.

The term external pipes could include embodiments which have fluidly connected external pipes, conduits or channels suitable for the recirculation flow required to and from the bath waste assembly (100). Equally the term external pipes could extend to pipes, conduits or channels which could be integrated into or moulded into the bath waste assembly (100) for example.

In an embodiment the external pipes (170, 175, 180) could be known as a second flow path channel (181) or second flow path pipe which optionally could include the heater (185) element, pump (P) and filter (not shown) in the fluid path.

The drain plug (120) in this example embodiment has two functions. The first function is to act as a conventional plug to either retain or allow the fluid to drain held in the bath (200) as is conventional. The second function is to direct flow to and from the bath (200) as shown in figure 2, fluid flow arrows F1 and F7 show the flow of fluid in a way that the heated fluid is mixed properly within the bath (200). In this embodiment of figure 2, the return flow of fluid (115) to the bath is shown by flow arrow 7 and it is directed to the substantially vertical side of the bath (200) which will ensure fluid is mixed well in the greater volume of fluid in the bath (200) and also less likely to flow directly onto a users feet if the fluid were hot.

The direction of flow arrow (F7) is ideally in a direction that discourages direct cross over flow from flow arrow (F7) to flow arrow (F1), as if this happened it could be that freshly heated fluid flow (F7) from the bath waste assembly (100) could be sucked straight back into the flow (F1) and not mix properly in the bath (200).

Fig 4A shows an isometric cross section example of a drain plug (120) which could be used in the example physical embodiment developed from figure 3 and is utilised in the embodiment shown in Figures (7A, 7B, 7C). The cross section figure 4A effectively shows half a drain plug (120) and could be symmetrical on both sides of the section as an example. The drain plug (120) shows two guides (125) which ensures the guide plug will work smoothly and directs fluid flow effectively.

The guide (125) could extend the full length of the drain plug (120) and there would be at least two guides (125), one on each side of the drain plug (120) as an example. The guides (125) are configured to be male sliding guides which would run in mating slots in the bath waste assembly case (105). The guides (125) would form a fluid seal with the mating slots in the casing portion (106) as shown in figure 4B.

Fluid flow arrows F1 and F7 show the fluid flow directions on either side of the plug when the plug is in the closed position for example.

Fig 4B shows a cross section taken from fig 4A, through the drain plug (120) example along the axis x-x in the direction of arrow A. This section shows one guide (125) in plan view and the mating slot (126) feature formed in a casing portion (106) of the bath waste assembly case (105). A continuous sheet material barrier (128) such as plastic for example spans between both of the opposing guides (125) to form a fluid barrier (128) between the drain plug regions (110A,110B) shown on figures 2 and 3. Figure 4A shows the split flow paths (F1,F7) which is ensured by the presence of the sheet material barrier (128).

When the drain plug (120) is slid into position in the bath waste assembly (100) the guides (125) are engaged and sliding in the slots (126) and form a fluid seal between the drain plug regions (110A,110B). There is little mixing between the regions (110A, 11 OB) across the plug in this embodiment due to the above fluid seal.

In another embodiment it could be possible for the second outlet (140) to be lower than the second inlet (150) or visa versa.

In another embodiment it could be possible for the second outlet (140) to be lower than the second inlet (150) and a heater element (185) to be fitted to external pipes (170, 175, 180) but with no pump (P). In this embodiment the flow of fluid could be achieved using buoyancy flow due to changing fluid density due to temperature rise as is known.

Fig 5 shows a second example embodiment of a bath waste assembly (300) and in this example embodiment figure 5 shows a bath (200) with two standard cut outs for the waste opening (160) and the overflow opening (165). In this second example embodiment, the bath waste assembly (300) is shown installed or disposed between both the standard waste opening (160) and the overflow opening (165) and will now be described.

In the second example embodiment the bath waste assembly (300) has a first bath fitting (300A) and second bath fitting (300B) which fit into the standard bath waste opening (160) and the overflow opening (165) respectively without any modification to the bath or surroundings. A pump (P), heater (385) element, level sensor (L1), pressure sensor (P1) and temperature sensors (S1,S2) are fitted in or on pipes or conduits which are fluidly connected between the first and second bath fittings (300A,300B). The fluidly connected pipes (391, 392, 393) could also be collectively called fluidly connected as a second flow path channel (381).

Describing the fluid flow in this embodiment, the first bath fitting (300A) has a second outlet (350) which is fluidly connected to the pipe (391). Fluid can flow from first flow path (310) through the second outlet (350) and into the pipe (391).

Temperature sensors (S1,S2) are shown fitted in/on the pipe (391). The pipe (391) is fluidly connected to the pump (P) inlet and the pump outlet is fluidly connected to the pipe (392). The pipe (392) takes pumped fluid from the pump (P) and is fluidly connected to the heater (385) element inlet. Fluid can flow through the heater (385) element into pipe (393), which is fluidly connected to the second bath fitting (300B). Once fluid reaches the second bath fitting (300B), fluid flow can return to the bath through the second inlet (360).

In this way it is possible to take water from the bath (200) via the first bath fitting (300A), heat it as required and then return the fluid to the bath via the second bath fitting (300B). Temperature sensors (S1,S2), pump (P), pressure sensor (P1) and fluid level I presence sensor (L1) could be placed in different positions to that described and should not be treated as being limited to these positions shown in fig 5. A conventional drain plug (320) is shown fitted to the first bath fitting (300A) but an alternate rod operated or cable operated plug could be used (not shown) as is known in the art. If the drain plug (320) is in the closed (fitted) position then fluid is retained in the bath (200) and fluid flow is possible from the second outlet (350) to the second inlet (360) through the second flow path channel (181) as described before. In this situation, fluid (315) would be returned to the first flow path (310) in the bath (200) after optional heating and would be free to mix with the bath fluid(315) held in the bath (200). Flow arrow (FR) shows fluid returning to the bath (200). If the drain plug (320) is in the open (removed) position then fluid is able to drain from the bath (200) from the first flow path (310), then to the first outlet (330) to a drain (not shown). If the drain plug (320) is in the open (removed) position then fluid is also able to drain from all of the pipes (391, 392, 393), heater (385) and pump (P) to totally drain the system to the main drain (not shown) via gravity.

In an embodiment the external pipes (391, 392, 393) could be known as a second flow path channel (381) or second flow path pipe which optionally could include the heater (385) element, pump (P) and filter (not shown) in the fluid path. A standard bath overflow pipe (355) is shown as being integrated to second bath fitting (300B) such that no extra holes would need to be cut into the bath structure. If the bath did overfill for any reason then fluid would reach the pipe overflow (365) and then drain via pipe (355) to either a pipe connected to the second bath fitting (300B) or to another drain point not shown.

In this second embodiment, the first flow path (310) is located above the first bath fitting (300A) and it can be seen from figure 5 that the first flow path (310) could represent a large volume of fluid, anywhere between or in the region of the second inlet (360) and the second outlet (350). For example in this second embodiment fluid (315) once entering the bath from the second inlet (360) is able to mix freely in the bath and follow a variable route through the volume of fluid in the bath (200) before it once again exits the bath (200). For example if a person was getting a bath at the time, any fluid entering the bath from the second inlet (360) could be dispersed in the bath and mixed and reside in the bath (200) for some time before it found its way back into the second outlet (350) again.

In an embodiment it could be possible to have a duct or conduit attached to the standard overflow opening (165) on the inside of the bath (200) volume such that when flow entered the bath through the second inlet (360), the fluid (315) could be directed downwards into the bath more specifically. On example benefit of this would be that the duct (not shown) could be designed to exit below the level of water in the bath such that the return flow of fluid into the bath was quiet and with no splashing effect.

Figs 6A and 6B show two views of another detailed example apparatus of the first example embodiment shown in fig 1 and shows separate example parts assembled to the bath 200. Fig 6A is a sectional view of fig 6B taken along the plane Y-Y. The construction and method of assembly to a bath (200) will now be described using fig 6A and 6B.

Fig 6A shows a waste assembly (400) which is made from two major interlocking components when assembled being a top hat flange (410) and a waste casing (420). The waste casing (420) for example has several components integrated into it being the temperature sensors (S1, S2) , pump (P), water level I presence sensor (L1) and heater (485) element and it is understood that this waste casing (420) could be fitted with all of these components as a sub assembly under the bath for installation.

The method of assembly requires the top hat flange (410) to be placed downwards through the bath (200) standard waste opening (460) and a seal (470) to be placed between the top hat flange (410) and the bath (200). The interlocking waste casing (420) would be offered up underneath the bath (200) with a seal (471) placed between the waste casing (420) and the bath (200) and a further seal (472) placed in the recess (475). The top hat flange (410) would be now slid into the waste casing (420) with the bath (200) sandwiched between. As the top hat flange (410) slides into the waste casing (420) the seal (472) would be sandwiched between the two and the waste casing (420) and top hat flange (410) would be secured together using a screw (440) for example.

The fluid flow will be described now with respect to figs 6A and 6B. Entry of fluid from the bath (200) to the bath waste assembly (400) is shown with flow arrow (F1) from the first flow path (490) through the waste entry conduit (493) . Flow then follows the path of flow arrow (F3) through pipe (570) as it approaches the pump (P). The fluid is then pumped in the direction of flow arrow (F4) in pipe (575), past the heater (485) element and then into pipe (580) following the flow path (F5) towards the waste exit conduit (494) to return the fluid to the bath (200) and the first flow path (490). The fluid flow return to the first flow path (490) is indicated by the flow arrow (F7).

In this embodiment the seal (472) gives a seal between the top hat flange (410) and the waste casing (420) and also an adjustable sliding capability to allow for variable thicknesses of Bath (200) skin (425). For example, by tightening the screw (440) into the threaded boss (430) the seals (470,471) may become compressed and sandwiched between the top hat flange (410), the bath (200) and waste casing (420) respectively and the surfaces (426, 427) are able to slide relative to each other whilst maintaining and effective fluid proof seal. An important feature of this example embodiment is the method of sealing between pipe (580) and pipe (570) such that when the fluid is pumped from the pipe (580) in the direction of flow arrow (F7) it is not possible for significant amounts of fluid to cut across the bath waste assembly (400) instead. To ensure that fluid flow is made to enter the bath through the waste exit conduit (494) the guide (423) runs in the slot (424) as an light interference fit to act as a seal. This seal runs down the length of the top hat (410) and creates a barrier between the cavities (437, 438) formed between the top hat (410) and waste casing (420), thus preventing substantial direct flow to cross between pipe (580) and pipe (570). In this way, it is ensured that heated fluid flows in the direction of flow arrow (F7) via the bath waste exit conduit (494) into the bath (200), then cooler fluid is exchanged out of the bath (200) in the direction of the flow arrow (F1) via entry conduit (493). Note the drain hole (429) does allow some flow from pipe (580) to flow back into the bath (200) as shown by flow arrow (F7A), but the main job of drain hole (429) is to allow the pipes (570, 575, 580) to drain when the drain plug (445) is in the open position. In this embodiment pipes (570, 575, 580) could also be called a second flow path channel (581).

Figure 6A shows a drain plug (445) fitted and in the closed position which ensures that when the pump (P) is pumping the fluid (115) is pumped from the bath (200), via the heater (485) element and then recalculated back into the bath as described before. Figure 6C shows the drain plug (445) in the open position caused by the plug being pulled in the direction of the arrow B.

In the open position it is now possible for the fluid (115) to drain from the bath (200) using the route shown by the arrows F8, F9 and F10. Flow arrow (F8) shows fluid draining from the first flow path (490) in the bath (200) via the first drain holes (487A) into the waste assembly (400). As the plug (445) is now in the open position in figure 6C the drain plug (445) is pulled away from the seat (435) which allows fluid to flow between the drain plug (445) and the seat (435) as shown by flow arrow F10. Fluid flow then drains through holes (487B, 487C) which are fluidly connected and fluid flow F10 then passes to a mains drain (not shown)

Drain hole (429) is a drain hole that fluidly connects pipes (570, 580) to the plug cavity (567) and allows the pipes (570, 580) to drain down fully as shown by flow arrow F9 when the stopper (445) is in the open position.

It is understood that the drain hole (429) may also allow a small amount of fluid flow to be pumped into the plug cavity (567) and up into the bath essentially as an alternate method of returning the heated fluid flow back into the bath (200) , instead of the main route of using flow arrow (F7) through the conduit (494).

Another detailed example of the first embodiment shown in figure 1 is shown in figures (7A,7B,7C) and this embodiment shares the same recirculation principle through the external pipes (670,675, 680) or collectively known as the second flow path channel (681) and common sealing features to the previous embodiment (6A) . In summary, fluid flow is taken from the first flow path (690) in the direction of flow arrow (F1C), then down through the hole (645) in the top hat (610), then flow passes through hole (646) in the waste casing (620), again following the flow arrow (F1C) to the inlet of pump (P). Flow then is pumped around pipes (670,675, 680) following flow arrows (FC3, FC4, FC5) respectively, over the heater (685) element and temperature sensors (S1,S2). Flow then continues along flow arrow (F7C), through hole (648) in the bath waste casing (620), then through hole (648) in the top hat (610) continuing along the flow arrow (F7C) to return to the bath (200) into the first flow path (690).

Figure 7B is a plan view of the bath waste assembly (600) of the first embodiment, figure 7A is a cross section taken through the section plane Z-Z of figure 7B with the drain plug (620) in the closed position and figure 7C is a cross section taken through the section plane Z-Z of figure 7B with the drain plug (620) in the open position.

Figures (7A,7B,7C) show extra detail on how a shaped drain plug (620) can help the recirculation flow into and out of the bath in a way that could encourage mixing of hot reticulated fluid in the cooler bath (200), before fluid it can be taken back into the bath waste assembly (100,600). If the hotter fluid being pumped back into the bath (200) shown by flow arrow F7C does not mix effectively with the bulk volume in the bath then there is a danger of the fluid flow F7C being pulled immediately back into the suction side of the drain plug (120, 620) and heating of the bath fluid would be reduced. To avoid poor mixing the bath drain plug (620) could have a shape that ensures the direction of fluid flow FC7 is in an opposite direction to that of the flow shown by flow arrow FC1 entering the bath waste assembly (100,600). This could maximise mixing and circulation in the bath in the region of the first flow path (690). One or more water flow deflectors could be disposed in the bath drain plug (120, 620) or disposed between the second inlet (150) and the second outlet (140) to direct fluid in various directions to aid in the mixing of the bath water and also to avoid the freshly heated water from being directed at the bath users feet.

If a cross section of the drain plug (620) were drawn it would be similar to figure 4A and would show guide (623) and slot (624) similar to guide (125) and slot (126) features and a web barrier similar to barrier (128) of figure 4A. Again these features are present in figures (7A, 7B and 7C) to prevent direct fluid flow from (F7C) to (F1C) across the drain plug within the bath waste assembly (600). A drain plug seal (670) is attached to the bottom of the drain plug (620) and seals against the top hat seat (668) when the drain plug is in the closed position, preventing the bath (200) from draining.

Figure 7C shows the drain plug (620) in the open position and there is a way for both the bath (200) fluid and the fluid contained in the bath waste assembly (600) to drain away to a main drain (not shown). With the drain plug (620) in the open position the fluid can flow from the bath (200) via the flow arrows F8C into the bath waste assembly (600). Note that it is possible for fluid to drain from the first flow path (690) into the bath waste assembly (600) on both sides of the drain plug (620).

Flow is free to continue due to gravity on the fluid flow path F10C and on to the first outlet (630), then the main drain (not shown). Additionally all fluid held in the pipes (670,675,680), the pump (P) and heater (685) element is free to drain due to gravity in the direction of flow arrow F9C, then onto the fluid flow path F10C and then on to the first outlet (630), then the main drain (not shown). The fluid flow path F10C is possible in this embodiment using the drain holes (687B, 687C) which are present in top hat flange (610) and a waste casing (620) respectively.

Note the fluid barrier created by the guide (623) running in the slot (624) as described before has as an light interference fit to act as a seal and so no fluid would be able to cross directly from one side of the plug to the other side of the plug in this embodiment when the plug was in the closed position. Fluid flow when the plug was in the closed condition would only be possible via the external pipes (670, 675, 680).

Controls

Figure 8 shows an example control system for the bath waste fitting (100) and the main elements of the bath waste fitting have been connected in series much like that described in the previous embodiments.

In the diagram figure 8, the bath (200), pump (P), Heater (785), temp sensors (S1, S2), level sensor (L1) and inline filter (750) are shown connected in series as have been described previously using pipes (770,775,780,785,790). A flow direction is shown on the pipes but could be reversed.

The controller (720) could be electrically connected to the sensors (S1,S2,L1), heater (785) and pump (P) which are attached to the bath (200) as previously described in the bath waste fitting (100). The controller (720) could be mounted to the bath waste fitting (100) or could be mounted remotely and be connected by wires or wifi for example. A controller (720) could read temperature signal inputs from S1 and S2 and water level /presence sensor (L1). S1 and S2 could be an analogue output delivering a constant reading of temperature to the controller (720) or the outputs of S1 and S2 could be direct switched outputs. For example S2 could be a bi metallic operating switched contact which acted as a high temperature power supply cut to the heater if a second temperature were exceeded. The level sensor (L1) could be any suitable sensor able to detect water was present inside the bath waste fitting (100, 400, 600) A temperature set point threshold control (760) could be included which would allow the user to set a target set point threshold temperature (TSetP) for the bath fluid to be kept at by the heater (185) element.

The temperature set point control (760) could be in software within the controller (720) or it could be a mechanical thermostatic device using an adjustable bimetallic switch, both settable by the user.

Alternatively the bath waste fitting (100, 600) could have a adjustable set point threshold on the bath waste fitting (100) in which the set point would be fixed on installation by the user. This set point threshold (TsetP) could be settable form anywhere between 1 degrees C and 60 degrees C. A status indicator (765) could be an LED screen or light system fitted to the bath waste assembly (100, 600) of be mounted remotely. The status indicator (765) could be a simple indicator which has a green light showing 'active and heating' or 'off if no water was present. Additionally the light could change to amber for example if the filter needed cleaning and ultimately red if there was a bath waste assembly (100, 600) fault. A remote mounted status indicator (765) could be a wired item connected to the controller (720) or could even be wifi connected.

Figure 8 also shows the inclusion of an example fluid filter in the flow path of the fluid, the position could be anywhere in the bath waste fitting (100) and the position shown flow is not meant to be limiting. The fluid flow is shown in one direction but the fluid flow could be in the other direction.

Figure 9 shows an example control method for the system shown in figure 8.

The control method starts at control step (820) when the controller receives a power supply. The controller (720) then checks at step (830) whether the fluid level sensor (L1) is detecting the fluid level is OK to continue which requires that fluid (water) is present in the bath and the water level is sufficient to cover the heater (785) element and the pump (P) in the bath waste fitting (100). If enough fluid were present then the pump (P) could start pumping as indicated in box (840) . In the next control step (845) it checks whether the temperature of sensor (S1) is below a lower temp level (TsetL) and if it is then the heater is switched on at step (860) and if not then the heater is switched off at step (850).

The controller checks to see if the temperature rise rate in degrees per second is too high, indicating possible blocked pipework, at step (865) and if it is then the heater (785) element is switched off at step (870), otherwise the controller moves to the next step (875) where the controller looks at the temperature sensor (S2). If temperature sensor (S2) is greater that a temperature level (TsetH) then the system shuts down as the temperature of the fluid is deemed to be too high for safe use and is indicative of a fault, otherwise the controller returns to step (845) and runs through the above again.

Optionally a means of temperature set point control (760) could be incorporated into the controller (720) such that the temp level (TsetL) was adjustable.

In another embodiment it may be possible to control the temperature difference between the water entering the bath waste assembly (100, 300, 400,600) and recirculating to the bath waste assembly (100, 300, 400,600) by varying the speed of the pump.

Filter

In another embodiment there may be a filter shown in figure 8 which could be fitted to the second flow path channel (181, 681) ((external pipes (670, 675, 680) in the above example), or to the drain plug (120,620). The purpose of the filter could be to prevent any items such as hair, non soluble bath products or debris from entering the external pipes (670, 675, 680) which could prevent the pump from working or directly blocking the pipes in the second flow path channel (181,681). The example filter material or mesh could be fitted to the drain plug (120), 620 in the path of the fluid flow arrow F1C to prevent the debris from entering the bath waste assembly (100, 600)

In another embodiment the filter (not shown) could be cleanable if the filter was removable with the drain plug (120, 620) for easy access for example.

Any suitable mesh, grill or porous material could be used for the filter.

Blocked filter

In another embodiment it may be possible to detect a blocked filter by using the temperature rise rate of the fluid passing the temperature sensor (S1). For example, if the second outlet pipe (140) had a filter (not shown) in it and the filter (not shown) became blocked then the water flow rate passing the temperature sensor (S1) could reduce but the heater (185) element could still be heating the water at full power. In this case the temperature rise rate of the fluid passing the temperature sensor (S1) could be higher than with an unblocked filter (not shown)

In another embodiment based on figure 6C for example, in could be possible to create raised surfaces (492) around the entry and exit conduits (493, 494, 487A) of the top hat flange (410). The purpose of these raised surfaces (492) would be to act as debris filters in the lower level of the bath. For example, if all the entry and exit conduits (493, 494, 487A) had raised surfaces around the orifices then any debris like non soluble bath salts and other solids could collect around them and not be sucked into the pump (P) flow casing potential blockages.

In another embodiment, it may be possible to detect a person getting into the bath if the pressure sensor detected a fluid level rise. This detection could be used by the controller to start or change the pump flow rate or change a status indicator on a display to advise the user that the bath is aware of the users presence.

In another embodiment there may be a filter or pipe bypass which is activated on pressure detection using a controlled valve or it could be a mechanical device to relieve pressure build up in the pipes if say any one of the pipes (170, 175, 180), heater (185) element or filter (750) became blocked of constricted. This could prevent overheating of the water in the bathe waste assembly (100). For example a bypass pipe (not shown) could be fitted anywhere between the second outlet (140, 350) (after the pump (P)) and the second inlet (150, 360) which would give an alternate route for fluid to take if the pressure built up too high in the pipes (170, 175, 180). Entry to the bypass pipe (not shown) could be via a pressure relief blow by device which could have a presetable operating point based on pressure or indeed it could use the pressure detected by pressure sensor (P1) and using a controller (720) could open a directional valve (not shown) to divert flow as would be know to a person skilled in the art. A controller could be monitoring for pressure build up in the pipes could have a pressure sensor (P1) measuring pressure. For example, if the pressure in the fluid system reached or exceeded a pressure threshold (Psetb) the controller could give indication to the user via the visual display that there was a problem in fluid flow or a blockage in the pipes.

The bath waste assembly (100), drain plug (120) could be made from plastic, metal or any suitable material as determined by best manufacturing methods.

Plug operation could either be by manual lifting using a conventional handle or chain from above, rod or lever operation from below as is common, he plug could also have a lift and twist locking mechanism which is known.

The conventional bath overflow pipe (127,355) is shown for completeness but does not form part of the invention and as such the overflow pipe (127, 355) could be either integrated into the bath waste assembly (100, 300) or could be plumbed into the extended drain pipe work (not shown).

Figure 10 shows a diagram of a standard high volume bath (prior art) and the example positions of the standard waste opening (160) and the standard overflow opening (165) in the bath skin or shell. The bath skin can have a thickness of anywhere between 3mm and 10mm but the standard thickness is circa 5mm. Again the overall dimensions of a standard bath may vary from maker to maker and be dependent upon style and any of the dimensions listed should not be taken as limiting. Other bath dimensions are possible. It can be see from figure 10 that the standard waste opening (160) is formed in the bottom of the bath on a substantially horizontal surface defined between the X and Y axis and the bath waste fitting would be fitted on this surface or plane in the first embodiment example. There may be a slight taper towards the waste opening (160) from the horizontal plane which is a design feature put in to ensure that water drains to that point. The waste opening (160) is at the lowest point in the bath (200) usually.

The standard overflow opening (165) is formed in the substantially vertical surface of the bath skin although it is common for this surface to inclined away from the user for improved comfort or aesthetics by up to 20 degrees for example and in this description substantially vertical should be assumed to include this incline. The substantially vertical surface is defined between the Y and Z axis and the standard overflow opening (165) would be fitted on this surface or plane in the first embodiment example.

The standard waste opening (160) and the standard overflow opening (165) are in the majority but not always within a certain distance of each other due to the standard nature of plumbing fittings sold to fit to the bath commonly known as a waste trap kit. The waste trap kit usually supplies both a overflow including plug kit, a waste trap and an overflow pipe between the two as is known by any skilled person.

Distances between the standard waste opening (160) centre and the standard overflow opening (165) centre can vary but upon investigation the usual distances are between circa x1= 150mm to 250mm, y1= 0 (because usually the standard waste opening (160) centre and the standard overflow opening (165) are on the same centre line due to symmetry) , z1 = 280mm to 360mm. These dimensions are examples only and should not be treated as limiting. These dimensions are shown in figure 10 for example. Other dimensions are possible and it should be noted that dimensions are difficult to establish due to the tapered nature of the bath sides in some instances.

Like reference numbers have been used between the figures where possible.

It will be appreciated that various changes and modifications can be made to the present invention without departing from the scope of the present application.

The bath waste assembly could be fitted with a controller (720) comprising a processing means and a memory means, wherein the memory means comprises instructions that, when executed by the processor, cause the processor to implement a method as claimed in any one of claims 16-25.

It will be appreciated that embodiments of the present invention can be realised in the form of hardware, software or a combination of hardware and software. Any such software may be stored in the form of volatile or non-volatile storage such as, for example, a storage device like a ROM, whether erasable or rewritable or not, or in the form of memory such as, for example, RAM, memory chips, device or integrated circuits or on an optically or magnetically readable medium such as, for example, a CD, DVD, magnetic disk or magnetic tape. It will be appreciated that the storage devices and storage media are embodiments of machine-readable storage that are suitable for storing a program or programs that, when executed, implement embodiments of the present invention. Accordingly, embodiments provide a program comprising code for implementing a system or method as claimed in any preceding claim and a machine readable storage storing such a program. Still further, embodiments of the present invention may be conveyed electronically via any medium such as a communication signal carried over a wired or wireless connection and embodiments suitably encompass the same.

Claims

CLAIMS:

1. A bath waste assembly for fitting to a bath, the bath waste assembly comprising; a first flow path for allowing fluid to flow from or to the bath; a drain plug arranged to be in an open position or a closed position; a first outlet allowing fluid to flow from the bath to a drain; a second outlet and a second inlet being fluidly connected via a second flow path channel, wherein if the drain plug is in the open position, the fluid in the bath will drain via the first outlet, and if the drain plug is in the closed position, the fluid will be able to flow from the second inlet to the second outlet, by exchanging fluid with the volume of fluid contained in the bath.

2. A bath waste assembly as claimed in claim 1, wherein the bath waste assembly is disposed in the standard waste opening in the bath and fluid is taken from and returned to the bath through the standard waste opening when the drain plug is in the closed position.

3 A bath waste assembly as claimed in claim 1, wherein the bath waste assembly has a first bath fitting and second bath fitting which is disposed in the standard bath waste opening and standard overflow opening positions respectively in the bath, Wherein fluid is taken from the bath through the standard waste opening and returned to the bath through the standard overflow opening, when the drain plug is in the closed position.

4. A bath waste assembly as claimed in claims 2 or 3, comprising a pump (P), disposed between the second outlet and the second inlet to pump fluid through the bath.

5. A bath waste assembly as claimed in claims 2 or 3, comprising a fluid heater element disposed between the second outlet and the second inlet.

6. A bath waste assembly as claimed in any previous claim, wherein the second outlet is below the second inlet and when the fluid heater element heats the water a buoyancy flow pumps fluid around the second flow path channel.

7. A bath waste assembly as claimed in any preceding claim comprising one or more water flow deflectors disposed between the second inlet and the second outlet; wherein the one or more water flow deflectors can be in the bath waste assembly or plug and is configured to direct fluid into and/or out of the bath.

8. A bath waste assembly as claimed in any preceding claim comprising one or more fluid filter disposed between the second outlet and the second inlet.

9. A bath waste assembly as claimed in any preceding claim comprising a drain plug wherein one or more fluid filter is disposed in the drain plug and between the flow of second inlet and the second outlet.

10. A Bath Waste assembly as claimed in any preceding claim comprising one or more duct or conduit attached to the standard overflow opening on the inside of the bath volume, wherein when flow enters the bath through the second inlet, the fluid is directed downwards into the bath and optionally under the surface of the fluid in the bath.

11. A Bath Waste assembly as claimed in any preceding claim wherein one or more of any of the following; a temperature sensor (S1, S2); a fluid level or presence sensor (L1); a pressure sensor (P1) a thermal switch (S2) is disposed between the second outlet and the second inlet.

12. A Bath Waste assembly as claimed in any preceding claim comprising a bypass pipe disposed in or around the second flow path channel wherein the bypass pipe will bypass any one or more of: fluid heater element; pipes; filter; when pressure builds to a first threshold pressure (Psetb).

13. A Bath Waste assembly as claimed in claim 3 comprising an overflow pipe disposed in the second bath fitting.

14. A Bath Waste assembly as claimed in any previous claim wherein the return flow of fluid to the bath is directed to the substantially vertical side wall of the bath.

15. A bath waste assembly as claimed in any preceding claim comprising a status indicator using an LED screen or a light system wherein the status indicator would indicate one or more of the following status during bath waste assembly operation: normal operation, fault status, blocked filter or person detected entering the bath.

16. A method of controlling a bath waste assembly wherein the pump (P) is switched on only when a first fluid level is detected in the bath waste assembly by the fluid level or presence sensor (L1).

17. A method of controlling a bath waste assembly as claimed in claim 16 wherein the heater element is switched on to control the temperature of the fluid in the bath dependent on the temperature sensor (S1) temperature and the target set point temperature (TSetP).

18. A method of controlling a bath waste assembly as claimed in claim 17 wherein a target set point temperature (TSetP) is set by the user or could be a factory preset value.

19. A method of controlling a bath waste assembly as claimed in claim 18 wherein a target set point temperature (TSetP) could be set anywhere between 1 degrees C and 60 degrees C.

20. A method of control for a bath waste assembly as claimed in any one of claims 16 to 19 wherein the temperature rise rate of the temperature sensor (S1) is used to determine if the fluid filter is blocked or restricted.

21. A method of control for a bath waste assembly as claimed in any one of claims 16 to 20 wherein the heater element is switched off dependent on the temperature rise rate of the temperature sensor (S1) and/or a pressure or pressure rise rate in pressure sensor (P1).

22. A method of control for a bath waste assembly as claimed in any one of claims 16 to 21 wherein if the temperature of sensors (S1) or (S2) is greater than a second temperature (TsetH) then the bath waste assembly is switched off.

23. A method of control for a bath waste assembly as claimed in any one of claims 16 to 22 wherein a thermal cut out switch (S2) is disposed in the system and would need to be manually reset.

24. A method of control for a bath waste assembly as claimed in any one of claims 16 to 23 wherein the temperature difference between the water entering the bath waste assembly and recirculating back into the bath via waste assembly is controlled by varying the speed of the pump.

25. A method of control for a bath waste assembly as claimed in any one of claims 16 to 24 wherein the controller will detect a pressure rise from pressure sensor (P1) and do one or more of the following: user display will advise the bath user that the bath is aware of the users presence.; switch one or more of the pump (P) and heater on; change the pump flow rate.

26. A controller comprising a processing means and a memory means, wherein the memory means comprises instructions that, when executed by the processor, cause the processor to implement a method as claimed in any one of claims 16-25.

27. A method of assembly for a bath waste assembly as claimed in any one of claims 1 to 15, wherein the top hat is inserted into the waste casing and fixed together using the screw.

28. A bath comprising a bath waste assembly as described in any previous claim.